Transmission device

Claim 1

A CHAIN ASSEMBLY, FOR TRANSMITTING LOADS EITHER BY PULLING OR PUSHING, COMPRISING A PAIR OF STRANDS OF INTERCONNECTED LINKS EACH OF WHICH IS COMPOSED OF A ONE-PIECE BODY OF MATERIAL HAVING PRIMARY AND SECONDARY PLATE PORTIONS AND FORMED WITH A PAIR OF OPENINGS EXTENDINGA ONLY THROUGH SAID PRIMARY PLATE PORTION OF EACH LINK, ONLY ONE OF SAID OPENINGS PASSING THROUGH SAID SECONDARY PORTION THEREOF AND SAID SECONDARY PLATE PORTION EXTENDING PART OF THE WAY AROUNDL THE OTHER OF SAID OPENINGS OF EACH LINK AND HAVING SITUATED BEYOND SAID PRIMARY PORTION AN ELONGATED PROJECTION EXTENDING GENERALLY PARALLEL TO A PLANE WHICH INCLUDES THE AXES OF BOTH THE OPENINGS OF EACH LINK THE PRIMARY PLATE PORTION OF EACH LINK HAVING ATA THE OTHER OPENING WHICH PASSES ONLY THROUGH SAID PRIMARY PLATE PORTION AN ANNULAR PROJECTION FORMING AN EXTENSION OF SAID OTHER OPENING AND SURROUNDING IT IN PART WHILE BEING SPACED FROM SAID SECONDARY PLATE PORTION TO DEFINE WITH THE LATTER AN ARCUATE GROOVE, THE WHILE SAID SECONDARY PLATE PORTION IS FORMED WITH AN ANNULAR RECESS AT SAID ONE OPENING WHICH PASSES THROUGH BOTH OF SAID PLATE PORTIONS AND WHICH HAS AN INNER PERIPHERY EQUAL IN DIAMETER TO THE DIAMETER OF THE OUTER PERIPHERY OF SAID ANNULAR PROJECTION, SO THAT THE LINKS OF EACH STRAND CAN BE INTERCONNECTED WITH THE ANNULAR PROJECTION OF ONE LINK RECEIVED IN THE RECESS OF THE NEXT LINK WHILE THE SUCCESSSIVE LINKS ALTENATE WITH ONE LINK HAVING ITS SECONDARY PLATE PORTION ON ONE SIDE OF ITS PRIMARY PLATE PORTION WHILE THE NEXT LINK HAS ITS SECONDARY PLATE PORTION ON THE OTHER SIDE OF ITS PRIMARY PLATE PORTION, SAID STRANDS BEING SITUATED IN SUBSTANTIALLY PARALLEL PLANES WHICH ARE SPACED FROM EACH OTHER, AND A PLURALITY OF PINS, THE SUCCESSIVE LINKS BEING INTERCONNECTED BY SAID PINS WHICH PASS THROUGH THE OPENINGS OF THE INTERCONNECTED LINKS, SAID PINS RESPECTIVELY HAVING INTERMEDIATE PORTIONS SITUATED IN THE SPACE BETWEEN THE SUBSTANTIALLY PARALLEL PLANES IN WHICH SAID STRANDS ARE SITUATED, AND SAID PINS CARRYING IN THE SPACE BETWEEN THE LATTER PLANES GUIDE ROLLERS FOR GUIDING THE CHAIN ALONG A GIVEN PATH, SAID GUIDE ROLLERS BEING MADE OF A PLASTIC MATERIAL AND HAVING INTERIOR FRICTION SLEEVES WHICH DIRECTLY SURROUND SAID PINS RESPECTIVELY.